/*
 * Copyright (C) 2010-2018 Gordon Fraser, Andrea Arcuri and EvoSuite
 * contributors
 *
 * This file is part of EvoSuite.
 *
 * EvoSuite is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3.0 of the License, or
 * (at your option) any later version.
 *
 * EvoSuite is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with EvoSuite. If not, see <http://www.gnu.org/licenses/>.
 */
package org.evosuite.assertion;

import org.evosuite.testcase.TestCase;
import org.evosuite.testcase.execution.CodeUnderTestException;
import org.evosuite.testcase.execution.Scope;

public class NullAssertion extends Assertion {

    private static final long serialVersionUID = 8486987896764253928L;

    /**
     * {@inheritDoc}
     */
    @Override
    public Assertion copy(TestCase newTestCase, int offset) {
        NullAssertion s = new NullAssertion();
        s.source = newTestCase.getStatement(source.getStPosition() + offset).getReturnValue();
        s.value = value;
        s.comment = comment;
        s.killedMutants.addAll(killedMutants);
        assert (s.isValid());
        return s;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean evaluate(Scope scope) {
        try {
            if ((Boolean) value) {
                return source.getObject(scope) == null;
            } else {
                return source.getObject(scope) != null;
            }
        } catch (CodeUnderTestException e) {
            throw new UnsupportedOperationException();
        }

    }

    /**
     * {@inheritDoc}
     */
    @Override
    public String getCode() {
        if ((Boolean) value) {
            return "assertNull(" + source.getName() + ");";
        } else
            return "assertNotNull(" + source.getName() + ");";
    }

}
